Komatsu PC450-8 Operation & Maintenance Manual page 298

MAINTENANCE PROCEDURE
4. Continue to pump in grease until dimension (S) becomes
zero (0). If the tension is still loose, the pin and bushing are
excessively worn, so they must be either turned or
replaced. Please contact your Komatsu distributor for
repairs.
Loosening Track Tension
It is extremely dangerous to release the grease by any method except the procedure given below.
If track tension is not relieved by this procedure, contact your Komatsu distributor for repairs.
1. Loosen plug (1) gradually to release the grease.
2. When loosening plug (1), turn it a maximum of one turn.
3. If the grease does not come out smoothly, move the
machine forwards and backwards a short distance.
4. Tighten plug (1).
5. To check if the tension is correct, run the engine at low idle,
move the machine slowly forward (by an amount equal to
the length of track on ground), then stop the machine.
6. Check the track tension again, and if the tension is not cor-
rect, adjust it again.
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WARNING
MAINTENANCE